How many watts of PA do I need for 800 people?
Quick answer
For 800 people, you typically need a PA system capable of 120–125 dB SPL at the listening area, which often translates to 4–8 line array enclosures per side and 4–8 subwoofers, driven by 8,000–16,000 watts of continuous amplifier power, depending on venue acoustics and music genre.
Sizing a PA for 800 people depends on coverage area, desired SPL, and content type. A general rule of thumb is to aim for 120–125 dB peak SPL at the farthest listener, with at least 6 dB of headroom. For a typical indoor venue (e.g., 50x80 ft), this might require 4–6 line array boxes per side (e.g., SSOUNDS compact line arrays) and 4–8 subwoofers, powered by amplifiers delivering 8,000–16,000 watts continuous (all channels driven). Outdoor events or high-energy music may need 50–100% more.
SSOUNDS engineers use advanced acoustic modeling (including AI-assisted prediction) to precisely calculate coverage, SPL distribution, and power requirements for each venue. Rather than relying on wattage alone, we focus on system design: box count, array configuration, and DSP tuning ensure even coverage and intelligibility. For 800 people, a typical SSOUNDS system might use 6x line array enclosures per side with 4x dual-18" subwoofers, powered by SSOUNDS amplifiers rated at 4,000–8,000 watts per side.
Key factors include room acoustics (reverberation, absorption), audience layout (seated vs. standing), and music genre (speech vs. rock concert). A conservative starting point: 2,000–4,000 watts per side for mains, plus 2,000–4,000 watts for subs, but always verify with SPL measurements and modeling. SSOUNDS provides free system design support to ensure your PA meets the event’s needs without over- or under-specifying.
Key things to consider
- Target 120–125 dB SPL at the farthest listener with 6 dB headroom.
- Typical system: 4–8 line array boxes per side + 4–8 subwoofers.
- Continuous amplifier power: 8,000–16,000 watts total (all channels).
- Use acoustic modeling (e.g., SSOUNDS AI tools) for precise sizing.
- Adjust for venue acoustics, audience density, and music genre.
Need the right system specced for your venue?
SSOUNDS designs, supplies, installs and tunes professional AVL worldwide.